Fix typo in the data frame doc

[whitphx]

📚 Context

Fix the typo

🧠 Description of Changes

Revised:

Insert screenshot of your updated UI/code here

Current:

Insert screenshot of existing UI/code here

💥 Impact

Size:

• [x] Small
• [ ] Not small

🌐 References

• [ ] Notion

Contribution License Agreement

By submitting this pull request you agree that all contributions to this project are made under the Apache 2.0 license.

[sfc-gh-dmatthews]

Thanks @whitphx. I'll pair this with a companion PR to streamlit/streamlit and merge this this week.